Ohms Law Calculator

Calculate Ohms law

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Ohm’s Law Calculator. Below are three calculators used for Ohm’s law to calculate the Current, Voltage and Resistance. There are basic examples below this for how to use the calculator.

Voltage Volts
Resistance Ohms
Current Amps
Resistance Ohms
Current Amps
Voltage Volts
Voltage Volts
Current Amps
Resistance Ohms

Examples of how to use the calculator

Current

Find Current

In this circuit we have a 3Ω resistive lamp connected to a 6V battery. The current in the circuit is unknown. Find the current.

Using ohm’s triangle, we find the formula:

Current (I) = Voltage (V) ÷ Resistance (R)

Current = 6V ÷ 3Ω

Answer is 2A

Voltage

Find Voltage

In this circuit we have a 3Ω resistor connected to a battery with an unknown voltage. The current in the circuit is 2A. Find the voltage.

Using ohm’s triangle, we find the formula:

Voltage (V) = Current (I) x Resistance (R)

Voltage = 2A x 3Ω

Answer is 6V

Resistance

Find Resistance

In this circuit we have a resistive lamp connected to two 6V batteries, which are wired in series, providing 12V to the circuit. The current in the circuit is 0.5A. Find the resistance.

Using ohm’s triangle, we find the formula:

Resistance (R) = Voltage (V) ÷ Current (I)

Resistance = 12V ÷ 0.5A

Answer is 24Ω

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